Question

What year did the byzantine empire exist?

Answer 1

hope this helps https://en.wikipedia.org/wiki/Byzantine_Empire

Answer 2

1453
Its capital city was Constantinople (modern-day Istanbul), originally founded as Byzantium. It survived the fragmentation and fall of the Western Roman Empire in the 5th century AD and continued to exist for an additional thousand years until it fell to the Ottoman Turks in 1453 under the reign of Mehmed the Second.